Thanks, mate. By the way, I used the base of your silver material. So, a part of credits goes to you.
So, after all this hell with deforming Bender's limbs I understood 2 important things:
1. Always start a model facing -Z axis.
2. Deform a part of a model with Deform op only before positioning it to the base mesh (i.e. at 0,0,0). This way it's much easier to set the right start and end coords for the Deform op.